Estimation of the Formation Temperature from
the Inlet and Outlet Mud Temperatures While Drilling Geothermal Formations
Estimation of
the formation temperature is an important process when deciding whether
drilling should be stopped or continued. There are
several time consuming methods of estimating of the formation temperatures, for
example, the Horner-plot method ( e g Parasnis,
1971), a curve fitting method based on a numerical model (Chiba et al., 1982)
or analysis of fluid inclusion (e.g. Fujino and
Yamasaki, 1985). If formation temperature can be obtained from a wellbore
simulator based on mud temperatures, the formation temperature can be measured
while drilling resulting in advanced decisions such as whether drilling should
be stopped or continued can be judged immediately, and the cost of drilling can
be reduced. A wellbore simulator will be modified to achieve this goal. Field measurements will be
compared to model data.
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